Galvanizing process

What is the galvanizing process?

Galvanizing is the practice of submerging iron or steel into molten zinc at 450 C. to form a zinc coating. The zinc is metallurgically bonded to the materials surface which protects against corrosion in 2 ways;

  1. It shields the base metal from the atmosphere, which protects form rust formation;
  2. Because zinc is more electronegative than iron or steel, the zinc serves as a sacrificial anode, so that it protects cathodically exposed steel. In other words, since the zinc oxides 25 times slower than steel, it will act as a shield between the steel and the atmosphere.

procede_galvanisation

There are 3 steps in the galvanizing process:

  1. Surface preparation
  2. Galvanizing
  3. Finishing

1. Surface preparation:

Surface preparation consists of cleaning the steel to remove oxides and contaminates such as grease, dirt, rust and scale. The material is then submerged in a flux bath to cease the oxidation of the material.

We have 7 different tanks that can be used depending on material properties:

  • 1 caustic cleaning tank for the removal of organic contaminants (dirt, paint markings, grease, oils)
  • 2 rinse tanks (water)
  • 3 acid tanks at different acid levels
  • 1 flux tank to reduce oxidation before the material is dipped in the zinc

 

Dimensions of the tanks: 60’’ wide X 42’ long X 8′ deep.

2. Galvanizing:

The material is now ready for galvanizing. Once the steel is submerged in the zinc tank and the material reaches the temperature of the molten zinc, it is slowly removed to allow proper drainage of any excess zinc. It can be dipped with a racking system or by way of centrifugal process for smaller pieces.

3. Finishing:

The galvanized pieces are then inspected for any required filing (drainage locations) and packed accordingly to match the order at time of reception.

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